Interesting facts about arms

We use our hands every day, and it is almost impossible to imagine life without them. But what do we know about one of the most active parts of the body?

In this article you will find the most interesting facts about our arms and hands:

- there are no muscles in our fingers. The muscles that allow our fingers to move are located in the palms of our hands and in the middle of the forearm. They are connected to the bones of the fingers by tendons, which pull and control the fingers like puppets;

- the hand has been a symbol of protection since ancient times;

- your nails grow in a year by about the same amount as continents shift annually;

- to completely renew, fingernails require about 6 months, toenails - 2-3 times longer;

- the longest nails in the world belonged to Shidhar Chillal. They were 20 feet 2 inches long. It took 48 years to raise them;

- 12.6 percent of all men are left-handed, among women only 9.9 percent are left-handed;

- one third of all acute injuries involve injuries to the upper extremities;

- a quarter of injuries sustained in sports involve the hands and wrists;

- When the hand is in water for a long time, the skin of the palm becomes wrinkled. Why does this happen? The exact mechanism is unknown, but it is clearly controlled by nerves. When a nerve is in water for a long time, it loses its ability to smooth out wrinkles;

- white babies are four times more likely than black babies to be born with membranous fingers;

- the thumb is controlled by 9 separate muscles, which are controlled by 3 main nerves of the hand;

- on each hand there are: 29 large and small bones, 29 large joints, 123 ligaments, 34 muscles that control the fingers, 48 ​​nerves and 30 arteries;

- about a quarter of the motor cortex of the human brain is responsible for the movements of the arm muscles;

- according to their structure, nails are modified hair;

- the fingers are never completely straight. Typically, the index, ring, and little fingers are slightly curved toward the middle finger, while the middle finger may be curved in different directions.